linux-kernel - Re: [PATCH 4/4] mm: numa: Slow PTE scan rate if migration failures occur

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Message-ID: <20150308094128.GA15487@gmail.com>
Date:	Sun, 8 Mar 2015 10:41:29 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Dave Chinner <david@...morbit.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>, xfs@....sgi.com,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 4/4] mm: numa: Slow PTE scan rate if migration failures
 occur


* Mel Gorman <mgorman@...e.de> wrote:

> xfsrepair
>                                     4.0.0-rc1             4.0.0-rc1                3.19.0
>                                       vanilla           slowscan-v2               vanilla
> Min      real-fsmark        1157.41 (  0.00%)     1150.38 (  0.61%)     1164.44 ( -0.61%)
> Min      syst-fsmark        3998.06 (  0.00%)     3988.42 (  0.24%)     4016.12 ( -0.45%)
> Min      real-xfsrepair      497.64 (  0.00%)      456.87 (  8.19%)      442.64 ( 11.05%)
> Min      syst-xfsrepair      500.61 (  0.00%)      263.41 ( 47.38%)      194.97 ( 61.05%)
> Amean    real-fsmark        1166.63 (  0.00%)     1155.97 (  0.91%)     1166.28 (  0.03%)
> Amean    syst-fsmark        4020.94 (  0.00%)     4004.19 (  0.42%)     4025.87 ( -0.12%)
> Amean    real-xfsrepair      507.85 (  0.00%)      459.58 (  9.50%)      447.66 ( 11.85%)
> Amean    syst-xfsrepair      519.88 (  0.00%)      281.63 ( 45.83%)      202.93 ( 60.97%)
> Stddev   real-fsmark           6.55 (  0.00%)        3.97 ( 39.30%)        1.44 ( 77.98%)
> Stddev   syst-fsmark          16.22 (  0.00%)       15.09 (  6.96%)        9.76 ( 39.86%)
> Stddev   real-xfsrepair       11.17 (  0.00%)        3.41 ( 69.43%)        5.57 ( 50.17%)
> Stddev   syst-xfsrepair       13.98 (  0.00%)       19.94 (-42.60%)        5.69 ( 59.31%)
> CoeffVar real-fsmark           0.56 (  0.00%)        0.34 ( 38.74%)        0.12 ( 77.97%)
> CoeffVar syst-fsmark           0.40 (  0.00%)        0.38 (  6.57%)        0.24 ( 39.93%)
> CoeffVar real-xfsrepair        2.20 (  0.00%)        0.74 ( 66.22%)        1.24 ( 43.47%)
> CoeffVar syst-xfsrepair        2.69 (  0.00%)        7.08 (-163.23%)        2.80 ( -4.23%)
> Max      real-fsmark        1171.98 (  0.00%)     1159.25 (  1.09%)     1167.96 (  0.34%)
> Max      syst-fsmark        4033.84 (  0.00%)     4024.53 (  0.23%)     4039.20 ( -0.13%)
> Max      real-xfsrepair      523.40 (  0.00%)      464.40 ( 11.27%)      455.42 ( 12.99%)
> Max      syst-xfsrepair      533.37 (  0.00%)      309.38 ( 42.00%)      207.94 ( 61.01%)

Btw., I think it would be nice if these numbers listed v3.19 
performance in the first column, to make it clear at a glance
how much regression we still have?

Thanks,

	Ingo
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